Well, I've found simple and elegant solution.
there is a file in C:\Windows\SysWOW64\Macromed\Flash folder, named "manifest.json"
open it, change your version (mine was "126.96.36.199", to something like "188.8.131.52" and that will make your outdated plugin running
ps. use it on your own risk, as outdated flash player could possibly infect your PC (yet that never happened it my 15 years Microsoft MVP career)